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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Short-term Debt [Line Items] |  |
Total | $ 500 | $ 500
Weighted average interest rate | 0.38% | 0.15%
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Total | $ 500 | $ 500
Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
End of period interest rate | 0.63% | 0.38%

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